IFC 4.3.0.1 (IFC4X3) development

8.10.4.6 Pset_MaterialHygroscopic

8.10.4.6.1 Semantic definition

A set of hygroscopic properties of materials.

8.10.4.6.2 Applicable entities

8.10.4.6.3 Properties

Name Property Type Data Type Description
UpperVaporResistanceFactor IfcPropertySingleValue IfcPositiveRatioMeasure

The vapor permeability relationship of air/material (typically value > 1), measured in high relative humidity (typically in 95/50 % RH).

LowerVaporResistanceFactor IfcPropertySingleValue IfcPositiveRatioMeasure

The vapor permeability relationship of air/material (typically value > 1), measured in low relative humidity (typically in 0/50 % RH).

IsothermalMoistureCapacity IfcPropertySingleValue IfcIsothermalMoistureCapacityMeasure

Based on water vapor density.

VaporPermeability IfcPropertySingleValue IfcVaporPermeabilityMeasure

The rate of water vapor transmission per unit area per unit of vapor pressure differential under test conditions.

MoistureDiffusivity IfcPropertySingleValue IfcMoistureDiffusivityMeasure

Moisture diffusivity is a transport property that is frequently used in the hygrothermal analysis of building envelope components.

Table 8.10.4.6.A

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8.10.4.6.4 Changelog

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